A swash plate type compressor drive mechanism and compressor

Abstract

The present application belongs to the technical field of mechanical compressor, and discloses a swash plate type compressor driving mechanism and compressor. The driving mechanism comprises a motor assembly, a main shaft assembly, a swash plate assembly and a multi-stage piston assembly. The main shaft assembly is arranged in the motor assembly and connected to the swash plate assembly at one end. The piston assembly is hingedly connected to the swash plate assembly. The piston assembly comprises a first-stage piston assembly, which comprises a first-stage return block and a first-stage piston. One end of the first-stage return block is hingedly connected to the swash plate of the swash plate assembly, and the other end is floatingly connected to the first-stage piston. The multi-stage piston assembly adopts a floating connection form of return block and piston. The return block can simultaneously realize the functions of return and guidance, separates the load-bearing function and sealing function of the piston assembly, and makes the piston return while bearing the lateral force generated by the swash plate, thereby reducing the lateral force and friction force of the sealing ring of the small piston that plays a sealing role, and reducing the wear of the sealing ring.

Description

Technical Field

[0001] This invention belongs to the technical field of mechanical compressors, and more specifically, relates to a swashplate compressor drive mechanism and a compressor. Background Technology

[0002] High-pressure compressors have a wide range of applications, especially in the petroleum, chemical, and power industries, where they have become an indispensable key piece of equipment.

[0003] Because high-pressure air compressors have high output pressure and large compression ratios, they employ multi-stage compression to better save energy and dissipate heat. Currently, the multi-stage compression cylinders of multi-stage air compressors are radially distributed and driven by crank-connecting rod mechanisms. Therefore, existing air compressors have a large overall size and large inertial forces during piston reciprocating motion, which is not conducive to miniaturization and high-speed operation.

[0004] With the continuous development of compressors, swashplate compressors emerged. Most swashplate compressors use an integral swashplate drive mechanism, such as CN107642476A and CN103195688A. This type of integral swashplate compressor has a large radial rotational angular velocity of the swashplate, resulting in a high linear velocity of the swashplate-hemispherical hinge friction pair and severe wear. Later, split swashplate drive mechanisms appeared, such as CN108412728A. This type of split swashplate drive mechanism uses crossed roller bearings as the two relatively rotating parts of the split swashplate, resulting in a more complex implementation and a larger swashplate size.

[0005] Meanwhile, the dynamic seals of existing high-pressure compressors are mostly piston rings or packings. Both piston rings and packings have openings, which in principle present leakage paths. In addition, due to the special structure of piston rings and packings, their size cannot be reduced to within 10mm (diameter), so they cannot be used in miniature high-pressure compressors.

[0006] Most existing multistage compressors use oil lubrication for their drive components. Isolation devices are required to separate the high-pressure compressed gas from the lubricating oil. However, it is still unavoidable that a small amount of lubricating oil will mix into the gas, affecting the cleanliness of the high-pressure compressed gas and thus greatly hindering the subsequent high-pressure filtration. Summary of the Invention

[0007] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a swashplate compressor drive mechanism and compressor, which can meet the requirements of compressor miniaturization, high pressure and oil-free lubrication.

[0008] To achieve the above objectives, according to one aspect of the present invention, a swashplate compressor drive mechanism is provided, the drive mechanism comprising a motor assembly, a main shaft assembly, a swashplate assembly, and a multi-stage piston assembly, wherein the main shaft assembly is disposed within the motor assembly and one end of the main shaft assembly is connected to the swashplate assembly; the piston assembly and the swashplate assembly form a hinge connection.

[0009] The piston assembly includes a first-stage piston assembly, which includes a first-stage return block and a first-stage piston. One end of the first-stage return block is hinged to the swashplate of the swashplate assembly, and the other end is floatingly connected to the first-stage piston.

[0010] Furthermore, the first-stage return block includes a first L-shaped connector, a first cylindrical body, and a first cylinder. One end of the first L-shaped connector is connected to one end of the first cylindrical body. The first cylinder is disposed on the bottom surface of the first cylindrical body, with its open end located away from the first L-shaped connector. A first U-shaped groove is radially formed at the end of the first cylinder away from the first L-shaped connector. The first cylinder also has a second U-shaped groove. The first U-shaped groove and the second U-shaped groove are connected. The size of the first U-shaped groove is smaller than the size of the second U-shaped groove. The first-stage return block forms an insert-type floating connection with the first-stage piston through the first U-shaped groove and the second U-shaped groove.

[0011] Furthermore, the multi-stage piston assembly also includes a secondary piston assembly, which includes a secondary return block and a secondary piston, with the secondary return block and the secondary piston forming a floating connection.

[0012] Furthermore, the secondary return block includes a second L-shaped connector and a second cylinder. One end of the second L-shaped connector is connected to the second cylinder, and the other end has a first through hole and a first hemispherical groove. The end of the second cylinder connected to the second L-shaped connector has a second through hole and a second hemispherical groove. The first hemispherical groove and the second hemispherical groove are spaced apart from each other and together serve to accommodate part of the spherical surface of the hemispherical hinge, so that the corresponding hemispherical hinge and the secondary piston assembly form a hinge. The other end of the second cylinder has a third U-shaped groove and a fourth U-shaped groove, and the size of the third U-shaped groove is smaller than the size of the fourth U-shaped groove. The secondary return block forms an insert-type floating connection with the secondary piston through the third U-shaped groove and the fourth U-shaped groove.

[0013] Furthermore, the outer surface of the first L-shaped connector of the first-stage return block is an arc surface and has the same outer diameter as the first cylindrical body; the outer surface of the second L-shaped connector of the second-stage return block is an arc surface and has the same outer diameter as the second cylinder. Further, the drive mechanism also includes a connecting body, a cylinder, a multi-stage sealing ring, and a multi-stage cylinder liner assembly. The connecting body connects the motor assembly and the cylinder; the multi-stage sealing ring is disposed within the cylinder and is located between the multi-stage piston assembly and the cylinder; the multi-stage piston assembly is disposed within the cylinder and the connecting body, and is connected to the swashplate assembly via a hemispherical hinge.

[0014] Furthermore, the motor assembly includes a rear end cover, a stator, a rotor, a housing, and a front end cover. The rear end cover and the front end cover are respectively connected to opposite ends of the housing. The housing forms a first receiving cavity, and the stator is disposed on the inner wall of the first receiving cavity, which is used to drive the rotor mounted on the spindle assembly to rotate.

[0015] Furthermore, the spindle assembly includes a spindle, an angular contact ball bearing, and a deep groove ball bearing, the angular contact ball bearing and the deep groove ball bearing being respectively disposed on the rear end cover and the front end cover; one end of the spindle is disposed on the angular contact ball bearing, and the other end passes through the deep groove ball bearing and is connected to the swashplate assembly; the swashplate assembly includes a swashplate and a locking nut, the swashplate being sleeved on the outer circle of the swashplate end of the spindle; the locking nut is connected to the swashplate end of the spindle to fix the swashplate on the spindle.

[0016] Furthermore, one end of the connecting body is provided with a first receiving groove, the bottom surface of which is provided with a through groove and a stepped groove; the first receiving groove is used to receive the swashplate assembly and part of the multi-stage piston assembly, the through groove and the stepped groove are respectively used to receive part of the first-stage piston assembly and the second-stage piston assembly; one end of the cylinder is provided with a first groove and a second groove, the positions of the first groove and the second groove correspond to the positions of the through groove and the stepped groove, respectively, and the first groove is connected to the through groove, and the second groove is connected to the stepped groove; the bottom surface of the first groove is provided with a first receiving hole, and the bottom surface of the second groove is provided with a second receiving hole, both the first receiving hole and the second receiving hole penetrating the end of the cylinder away from the connecting body; the second receiving hole and the second groove are used to receive part of the second-stage piston assembly; the first groove and the first receiving hole are used to receive part of the first-stage piston assembly.

[0017] The present invention also provides a compressor, the compressor comprising a base and a swashplate compressor drive mechanism as described above, the drive mechanism being connected to the base.

[0018] In summary, compared with the prior art, the swashplate compressor drive mechanism and compressor provided by the present invention have the following advantages:

[0019] 1. This invention adopts a swashplate structure, integrating the motor assembly into the compressor drive mechanism. The integrated design of the swashplate assembly greatly reduces the radial and axial dimensions of the multi-stage compressor, thereby reducing the weight of the compressor.

[0020] 2. The present invention uses a hemispherical hinge and a return block mounted on a swashplate to convert the rotational motion of the motor-driven spindle into the reciprocating linear motion of a multi-stage piston assembly, which has the advantages of simple structure and smooth motion transmission.

[0021] 3. The multi-stage piston assembly adopts a return block and piston floating connection. The return block can simultaneously perform the return and guiding functions, separating the load-bearing and sealing functions of the piston assembly. The return block allows the piston to withstand the lateral force generated by the swashplate during its return stroke, thereby reducing the lateral force on the small piston responsible for sealing, decreasing the friction of the sealing ring, and reducing its wear. Simultaneously, the floating connection is implemented in a simple insert type, offering advantages such as easy installation and high reliability, significantly reducing the size of the multi-stage piston assembly. Furthermore, more oil-free lubrication surface treatment technologies with excellent friction properties are applied to the surface treatment of the multi-stage piston assembly, which is beneficial to improving the lifespan of the multi-stage compressor.

[0022] 4. The compressor drive mechanism provided by this invention has the advantages of small size, light weight and high pressure, and can effectively solve the problem of large wear of friction pairs under poor lubrication conditions, and can achieve complete oil-free operation, ensuring the cleanliness of the output gas. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a swashplate compressor drive mechanism provided by the present invention;

[0024] Figure 2 yes Figure 1 A cross-sectional view of the multi-stage piston assembly of the swashplate compressor drive mechanism;

[0025] Figure 3 (a) and (b) in the text are respectively Figure 1 A cross-sectional view and structural schematic diagram of the return block of the swashplate compressor drive mechanism in the image.

[0026] Figure 4 yes Figure 1 A schematic diagram of the first-stage return block of the swashplate compressor drive mechanism;

[0027] Figure 5 yes Figure 1A schematic diagram of the secondary return block of the swashplate compressor drive mechanism;

[0028] Figure 6 yes Figure 1 A schematic diagram of the multi-stage cylinder liner structure of the swashplate compressor drive mechanism.

[0029] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-spindle lock nut, 2-shaft end joint, 3-rear end cover, 4-angular contact ball bearing, 5-stator, 6-rotor, 7-housing, 8-spindle, 9-deep groove ball bearing, 10-front end cover, 11-swashplate, 12-connecting bolt, 13-spherical hinge, 14-lock nut, 15-secondary cylinder liner, 16-connecting body, 17-pressure plate, 18-cylinder block, 19-secondary piston assembly, 191-secondary return block, 192-secondary piston, 20-hex socket head cap bolt, 21-multi-stage seal ring, 22-first-stage piston assembly, 221-first-stage return block, 222-first-stage piston, 223-O-ring, 224-first-stage piston end cover. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Please see Figure 1 This invention provides a swashplate compressor drive mechanism, comprising a motor assembly, a main shaft assembly, a swashplate assembly, a hemispherical hinge 13, a connecting body 16, a cylinder 18, a multi-stage sealing ring 21, a multi-stage piston assembly, and a multi-stage cylinder liner assembly. The connecting body 16 connects the motor assembly and the cylinder 18. The multi-stage sealing ring 21 is disposed within the cylinder 18 and located between the multi-stage piston assembly and the cylinder 18. The multi-stage piston assembly is disposed within the cylinder 18 and the connecting body 16, and is connected to the swashplate assembly via the hemispherical hinge 13. The swashplate assembly is located within the connecting body 16 and is connected to one end of the main shaft assembly. The main shaft assembly is located within the motor assembly.

[0032] The drive mechanism is connected to the compressor base via the motor assembly, and the main shaft assembly is positioned within the motor assembly. The housing 7 of the motor assembly, the connecting body 16, and the cylinder 18 constitute the outer housing of the drive mechanism. The main shaft assembly, the swashplate assembly, the multi-stage cylinder liner assembly, and the multi-stage piston assembly are all housed within this outer housing. The main shaft assembly is positioned inside the motor assembly to drive the rotation of the swashplate assembly. The swashplate assembly is mounted on the right swashplate portion of the main shaft, and under the rotational motion of the main shaft assembly, the swashplate assembly generates axial reciprocating motion. The multi-stage piston assembly is connected to the swashplate via a hemispherical hinge 13, with the right end of the piston inserted into the cylinder 18. Driven by the axial reciprocating motion of the swashplate, the multi-stage piston assembly generates reciprocating linear motion. Through the cooperation of the above components, the problems of high friction coefficient and large wear of sliding friction pairs under poor lubrication or oil-free lubrication conditions can be effectively solved, meeting the requirements of oil-free, miniaturized and lightweight compressors. It has the advantages of small structural size, light weight, simple structure, low friction coefficient, good self-lubricating performance and low heat generation.

[0033] The motor assembly includes a rear end cover 3, a stator 5, a rotor 6, a housing 7, a front end cover 10, and hexagon socket head cap screws 20. The rear end cover 3 and the front end cover 10 are respectively connected to opposite ends of the housing 7. The rear end cover 3, the housing 7, and the front end cover 10 are connected together by the hexagon socket head cap screws 20. The housing 7 forms a first receiving cavity, and the stator 5 is disposed on the inner wall of the first receiving cavity, which drives the rotor 6 mounted on the spindle assembly to rotate. The rotor 6 is disposed within the first receiving cavity.

[0034] The spindle assembly includes a shaft end connector 2, a spindle 8, a spindle locking nut 1, an angular contact ball bearing 4, and a deep groove ball bearing 9. The angular contact ball bearing 4 and the deep groove ball bearing 9 are respectively mounted on the rear end cover 3 and the front end cover 10. One end of the spindle 8 is mounted on the angular contact ball bearing 4, and the other end passes through the deep groove ball bearing 9 and is connected to the swashplate assembly. The shaft end connector 2 cooperates with the spindle locking nut 1 to axially fix the spindle of the spindle assembly. The end of the spindle connected to the swashplate assembly is a swashplate structure, which is rotatably mounted in the motor assembly and rotates under the drive of the rotor 6.

[0035] The swashplate assembly includes a swashplate 11 and a locking nut 14. The swashplate 11 is sleeved on the outer circumference of the swashplate end of the main shaft and is positioned by the swashplate 11. The locking nut 14 is connected to the swashplate end of the main shaft to fix the swashplate to the main shaft. Driven by the main shaft, the swashplate generates an axial reciprocating oscillating motion to drive the multi-stage piston assembly to reciprocate.

[0036] The outer casing 7 is connected to the connecting body 16 by connecting bolts 12. One end of the connecting body 16 has a first receiving groove, the bottom surface of which has a through groove and a stepped groove. The first receiving groove is mainly used to receive the swashplate assembly and part of the multi-stage piston assembly, while the through groove and the stepped groove are used to receive the multi-stage piston assembly. The first receiving groove, the through groove, and the stepped groove together form a second receiving cavity.

[0037] One end of the cylinder body 18 is provided with a first groove and a second groove, the positions of the first groove and the second groove corresponding to the positions of the through groove and the stepped groove, respectively. The first groove is connected to the through groove, and the second groove is connected to the stepped groove. The bottom surface of the first groove is provided with a first receiving hole, and the bottom surface of the second groove is provided with a second receiving hole. Both the first receiving hole and the second receiving hole penetrate the end of the cylinder body 18 away from the connecting body 16.

[0038] The hemispherical hinge 13 is sleeved on the swashplate and rotatably connected to the multi-stage piston assembly, forming a hinge between the swashplate and the multi-stage piston assembly. The hemispherical hinge 13 has two ball heads symmetrically distributed on both sides of the swashplate. Each ball head includes a spherical surface and a flat surface; the flat surface fits against the swashplate, achieving planar contact; the spherical surface contacts the multi-stage piston assembly. To improve the lifespan of the drive mechanism under poor lubrication and oil-free lubrication conditions, both the hemispherical hinge 13 and the flat surface of the swashplate are coated with a self-lubricating coating or film (MoS2 or DLC).

[0039] Please see Figure 6 The multi-stage cylinder liner assembly includes a secondary cylinder liner 15 and a pressure plate 17. The secondary cylinder liner 15 is disposed on the inner wall of the second receiving cavity. The pressure plate 17 is fixed to the bottom surface of the first receiving groove using hexagonal screws to press the cylinder liner tightly. The secondary cylinder liner 15 includes a connected cylindrical surface and an arcuate surface. The cylindrical surface mates with the right end cylindrical surface of the secondary return block 191 of the multi-stage piston assembly, giving the secondary piston assembly 19 good guiding properties. The arcuate surface mates with the arcuate surface of the return portion of the secondary return block 191, giving the secondary piston assembly 19 good load-bearing capacity.

[0040] The multi-stage piston assembly is connected to the swashplate via a hemispherical hinge 13. Driven by the axial reciprocating oscillation of the swashplate, the multi-stage piston assembly generates reciprocating linear motion, compressing the gas. The multi-stage piston assembly includes a first-stage piston assembly 22 and a second-stage piston assembly 19, which are respectively disposed in the second receiving cavity and are hinged to the swashplate via the hemispherical hinge 13.

[0041] Please see Figure 2 and Figure 4 The first-stage piston assembly 22 includes a first-stage return block 221, a first-stage piston 222, an O-ring 223, and a first-stage piston end cap 224. The first-stage piston end cap 224 is connected to one end of the first-stage piston 222, and the other end of the first-stage piston 222 is connected to the first-stage return block 221 via a floating connection. The first-stage piston 222 can have a slight movement relative to the first-stage return block 221. The O-ring 223 is disposed between the first-stage piston 222 and the first-stage piston end cap 224. During compressor operation, the radial force generated by the first-stage piston assembly 22 is applied to the connecting body 16 by the first-stage return block 221, reducing the lateral force on the small piston that performs the sealing function and reducing the wear of the multi-stage sealing rings. The first-stage return block 221 serves to return the first-stage piston and guide the piston. The first-stage return block 221 integrates the two functions of return and guidance, significantly reducing the length of the multi-stage piston assembly.

[0042] The first-stage return block 221 includes a first L-shaped connector, a first cylindrical body, and a first cylinder. One end of the first L-shaped connector is connected to one end of the first cylindrical body. The first cylinder is disposed on the bottom surface of the first cylindrical body, with its open end located away from the first L-shaped connector. A first U-shaped groove is radially formed at the end of the first cylinder away from the first L-shaped connector. The first cylinder also has a second U-shaped groove, which is connected to the first U-shaped groove. The size of the first U-shaped groove is smaller than the size of the second U-shaped groove. The first-stage return block 221 forms a simple insert-type floating connection with the first-stage piston through the first U-shaped groove and the second U-shaped groove. The first U-shaped groove is inserted into the small-sized outer cylindrical surface of the neck of the first-stage piston, and the second U-shaped groove is inserted into the large-sized cylindrical surface of the end of the first-stage piston. During the reciprocating linear motion of the first-stage return block 221, the second U-shaped groove can drive the first-stage piston to reciprocate. The width of the second U-shaped groove is slightly larger than the width of the shaft end at the left end of the first-stage piston to ensure that the first-stage piston can produce slight floating. The floating connecting circular surface of the first-stage return block 221 is connected to the guide circular surface through ribs.

[0043] The first L-shaped connector has a first through hole and a first hemispherical groove at the end away from the first-stage piston. The bottom outer end of the first barrel-shaped shell has a second through hole and a second hemispherical groove. The first hemispherical groove and the second hemispherical groove are opposite to each other and spaced apart. They are used to accommodate part of the spherical surface of the hemispherical hinge 13, so that the hemispherical hinge 13 is hinged to the first hemispherical groove and the second hemispherical groove. In this embodiment, the central axis of the first hemispherical groove, the central axis of the first through hole, the central axis of the second through hole, and the central axis of the second hemispherical groove coincide.

[0044] Please see Figure 3 and Figure 5 The secondary piston assembly 19 includes a secondary return block 191 and a secondary piston 192, with a floating connection between the secondary return block 191 and the secondary piston 192. During compressor operation, the radial force generated by the secondary piston assembly 19 is applied to the connecting body 16 by the secondary return block 191. The secondary return block 191 serves to return the secondary piston and guide the piston. The secondary return block 191 includes a second L-shaped connector and a second cylinder. One end of the second L-shaped connector is connected to the second cylinder, and the other end has a communicating third through hole and a third hemispherical groove. The end of the second cylinder connected to the second L-shaped connector has a communicating fourth through hole and a fourth hemispherical groove. The fourth hemispherical groove and the third hemispherical groove are spaced apart from each other, and both are used to accommodate part of the spherical surface of the hemispherical hinge 13, so that the corresponding hemispherical hinge 13 and the secondary piston assembly 19 form a hinge. The other end of the second cylinder has a connected third U-shaped groove and a fourth U-shaped groove, with the size of the third U-shaped groove being smaller than that of the fourth U-shaped groove. The secondary return block 191 forms a simple insert-type floating connection with the secondary piston through the third and fourth U-shaped grooves. The third U-shaped groove is inserted into the outer cylindrical surface of the neck of the secondary piston, and the fourth U-shaped groove is inserted into the outer cylindrical surface of the left end of the secondary piston. During the reciprocating linear motion of the secondary return block 191, the fourth U-shaped groove can drive the secondary piston to reciprocate. The width of the fourth U-shaped groove is slightly larger than the width of the left end shaft of the secondary piston to ensure that the secondary piston produces slight floating.

[0045] The multi-stage sealing rings are installed in the cylinder body 18 and pressed against the right end face of the connector 16. The cylinder body 18 and the connector 16 are fixedly connected by hexagon socket head cap screws. The piston portion of each stage piston assembly is inserted into the inner hole of each stage sealing ring, generating a certain amount of compression to achieve dynamic sealing during the gas compression process. Preferably, the material of the multi-stage sealing rings is reinforced polytetrafluoroethylene (PTFE).

[0046] In this embodiment, in order to ensure the thermal efficiency of the compressor during operation, the outer shell 7, the connecting body 16 and the cylinder 18 are provided with heat dissipation fins in the circumferential direction to increase the heat dissipation through air convection.

[0047] In this embodiment, the motor spindle serves as the compressor spindle. Supported by angular contact ball bearings 4 and deep groove ball bearings 9 mounted on it, and driven by the motor assembly, the spindle rotates. The swashplate assembly is fixed to the spindle and oscillates axially, driving the piston to reciprocate linearly via a hemispherical hinge 13 and a return block. The spindle's rotational motion is converted into the piston's reciprocating linear motion by the swashplate, achieving the intake and exhaust of gas.

[0048] The drive mechanism provided by this invention optimizes the working condition of the friction pair, reduces the friction force between the friction surfaces, optimizes the motion of the high-speed heavy-duty friction pair, which is conducive to realizing the oil-free, high-speed and high-pressure operation of the compressor, and reduces the radial dimension of the swashplate compressor drive mechanism, which is conducive to realizing the miniaturization and weight reduction of the compressor.

[0049] The present invention also provides a compressor, the compressor comprising a base and a swashplate compressor drive mechanism as described above, the drive mechanism being connected to the base.

[0050] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A swashplate compressor drive mechanism, characterized in that: The drive mechanism includes a motor assembly, a spindle assembly, a swashplate assembly, and a multi-stage piston assembly. The spindle assembly is disposed within the motor assembly, and one end of the spindle assembly is connected to the swashplate assembly. The piston assembly and the swashplate assembly are hinged together. The piston assembly includes a first-stage piston assembly, which includes a first-stage return block and a first-stage piston. One end of the first-stage return block is hinged to the swashplate of the swashplate assembly, and the other end is floatingly connected to the first-stage piston. The first-stage return block includes a first L-shaped connector, a first cylindrical body, and a first cylinder. The multi-stage piston assembly further includes a second-stage piston assembly, which includes a second-stage return block and a second-stage piston. The second-stage return block and the second-stage piston form a floating connection. The second-stage return block includes a second L-shaped connector and a second cylinder. The outer surface of the first L-shaped connector of the first-stage return block is an arc surface and has the same outer diameter as the first cylindrical body. The outer surface of the second L-shaped connector of the second-stage return block is an arc surface and has the same outer diameter as the second cylinder. The drive mechanism further includes a connecting body, a cylinder, a multi-stage sealing ring, and a multi-stage cylinder liner assembly. The connecting body connects the motor assembly and the cylinder. One end of the connecting body has a first receiving groove. The bottom surface of the first receiving groove has a through groove and a stepped groove. The first receiving groove is used to receive the swashplate assembly and part of the multi-stage piston assembly. The through groove and the stepped groove are used to receive part of the first-stage piston assembly and the second-stage piston assembly, respectively. The first receiving groove, the through groove, and the stepped groove form a second receiving cavity. The multi-stage cylinder liner assembly includes a secondary cylinder liner and a pressure plate. The secondary cylinder liner is disposed on the inner wall of the second receiving cavity. The pressure plate is fixed to the bottom surface of the first receiving groove using hexagonal screws to press the cylinder liner tightly. The secondary cylinder liner includes a connected cylindrical surface and an arc surface. The cylindrical surface mates with the right end cylindrical surface of the secondary return block of the multi-stage piston assembly, giving the secondary piston assembly guiding properties. The arc surface mates with the arc surface of the return portion of the secondary return block, giving the secondary piston assembly load-bearing capacity.

2. The swashplate compressor drive mechanism as described in claim 1, characterized in that: One end of the first L-shaped connector is connected to one end of the first cylindrical body. The first cylinder is disposed on the bottom surface of the first cylindrical body, with its open end located away from the first L-shaped connector. A first U-shaped groove is radially formed at the end of the first cylinder away from the first L-shaped connector. The first cylinder also has a second U-shaped groove. The first U-shaped groove and the second U-shaped groove are connected. The size of the first U-shaped groove is smaller than the size of the second U-shaped groove. The first-stage return block forms an insert-type floating connection with the first-stage piston through the first U-shaped groove and the second U-shaped groove.

3. The swashplate compressor drive mechanism as described in claim 2, characterized in that: One end of the second L-shaped connector is connected to the second cylinder, and the other end has a connected third through hole and a third hemispherical groove; the end of the second cylinder connected to the second L-shaped connector has a connected fourth through hole and a fourth hemispherical groove, the fourth hemispherical groove and the third hemispherical groove are spaced apart from each other, and both are used to accommodate part of the spherical surface of the hemispherical hinge, so that the corresponding hemispherical hinge and the secondary piston assembly form a hinge; the other end of the second cylinder has a connected third U-shaped groove and a fourth U-shaped groove, and the size of the third U-shaped groove is smaller than the size of the fourth U-shaped groove; the secondary return block forms an insert-type floating connection with the secondary piston through the third U-shaped groove and the fourth U-shaped groove.

4. The swashplate compressor drive mechanism as described in claim 3, characterized in that: The multi-stage sealing ring is disposed in the cylinder body and is located between the multi-stage piston assembly and the cylinder body; the multi-stage piston assembly is disposed in the cylinder body and the connecting body and is connected to the swashplate assembly through a hemispherical hinge.

5. The swashplate compressor drive mechanism as described in claim 4, characterized in that: The motor assembly includes a rear end cover, a stator, a rotor, a housing, and a front end cover. The rear end cover and the front end cover are respectively connected to opposite ends of the housing. The housing forms a first receiving cavity, and the stator is disposed on the inner wall of the first receiving cavity, which is used to drive the rotor mounted on the spindle assembly to rotate.

6. The swashplate compressor drive mechanism as described in claim 5, characterized in that: The spindle assembly includes a spindle, an angular contact ball bearing, and a deep groove ball bearing, with the angular contact ball bearing and the deep groove ball bearing respectively mounted on the rear end cover and the front end cover. One end of the spindle is mounted on the angular contact ball bearing, and the other end passes through the deep groove ball bearing and is connected to the swashplate assembly. The swashplate assembly includes a swashplate and a lock nut. The swashplate is sleeved on the outer circle of the swashplate end of the spindle. The lock nut is connected to the swashplate end of the spindle to fix the swashplate to the spindle.

7. The swashplate compressor drive mechanism as described in claim 5, characterized in that: One end of the cylinder body is provided with a first groove and a second groove, the positions of the first groove and the second groove corresponding to the positions of the through groove and the stepped groove, respectively, and the first groove is connected to the through groove and the second groove is connected to the stepped groove; the bottom surface of the first groove is provided with a first receiving hole and the bottom surface of the second groove is provided with a second receiving hole, both the first receiving hole and the second receiving hole penetrating the end of the cylinder body away from the connecting body; the second receiving hole and the second groove are used to receive part of the second-stage piston assembly; the first groove and the first receiving hole are used to receive part of the first-stage piston assembly.

8. A compressor, characterized in that: The compressor includes a base and a swashplate compressor drive mechanism as described in any one of claims 1-7, wherein the drive mechanism is connected to the base.

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